Method and machine for making finned tube heat exchangers



Dec. 29, 1936. A. F. HOESEL 2,065,586

METHOD AND MACHINE FOR MAKING FINNED TUBE HEAT EXCHANGERS Filed Feb. 8,19:54 7 Sheets-Sheet 1 FIG. 4

INVE/VTO M W K Dec. 29, 1936. HOESEL 2,065,586

METHOD AND MACHINE FOR MAKING FINNED TUBE HEAT EXCHANGERS Filed Feb. 8.1934 7 Sheets-Sheet 2 fen M2 My Dec. 29, 1936. A. F. HOESEL METHOD ANDMACHINE FOR MAKING FINNED TUBE HEAT EXCHANGERS Filed Feb. 8, 1954 7Sheets-Sheet 5 Dec. 29, 1936. A. F. HOESEL 2,065,586

METHOD AND MACHINE FOR MAKING FINNED TUBE HEAT EXCHANGERS Filed Feb. 8,1934 7 Sheets-Sheet 4 HG. a. 6

INVENTOR Dec. 29, 1936. A. F. HOESEL 2,065,536

METHOD AND MACHINE FOR MAKING FINNED TUBE HEAT EXCHANGE RS Filed Feb. 8,1934 7 Sheets-Sheet 5 Dec. 29, 1936. HQESEL 2,065,586

METHOD AND MACHINE FOR MAKING FINNED TUBE HEAT EXCHANGERS Filed Feb. 8,1934 7 Sheets-Sheet 7 Patented Dec. 29, 1936 UNITED STATES METHOD ANDMACHINE FOR MAKING FINNED TUBE HEAT EXCHANGERS Anthony F. Hoesel,Chicago, 111., assignor to Peerless Ice Machine Company, Chicago, 111.,a

corporation Application February 8, 1934, Serial No. 710,262

24 Claims.

The present invention relates to a machine for the economical assemblyof spaced fins upon tubing, whereby the heat transfer surface of thetube is greatly increased. More specifically this application relates toa machine for the commercial manufacture of finned tubing heatexchangers as disclosed in my pending application Serial Number 591,086,filed February 5, 1932.

Heretofore, the manufacture of finned tubing was accomplished by a largeamount of manual labor in the spacing of the fins upon the tubing, eachfin having to be handled separately when placing the same in the spacingjig. There also existed a practical limit as to the length of tubingwhich could be handled in this manner since the tubing, generally, waspushed through the hole in the jig spaced fins.

The objects of my invention are to provide a machine whereby the finsare automatically spaced and aflixed to the tubing, also toautomatically provide for alternate finned and nonfinned portions oftube, the non-finned portions serving to make the return bends by meansof which the tubing can be nested, thereby eliminating soldered returnbends.

Figure 1 is an end view of a. fin upon the tubing prior to its beingafiixed thereto.

Figure 2 is a sectional view along line AA, Figure 1.

Figure 3' is a sectional view of the fin and tube after the afi'ixingoperation.

Figure 4 is a view of a tubing with alternate finned and non-finnedportions after bending the non-finned portions.

Figure 5 isa plan view, somewhat diagrammatic, of the fin separator, finfeeder, and fin affixing portion of the machine.

Figure 5a is a plan view, somewhat diagrammatic, of the fin spacing,tube moving means,

- 0 also the timing means providing for the alternate finned andnon-finned portions of the tube.

Figure 6 is an elevational view of Figure 5a.

Figure 7 is an elevational view of the fin afllxing means in the closedposition and along line 45 GG, Figure 8.

Figure 8 is a plan view of the fin afflxing means in the closedposition.

Figure 9 is an elevational view of the fin separator means.

Figure 10 is a vertical section on line 3-3,

Figure 9.

Figure 11 is a plan view of the timing locks in their unlocked position.

Figure 12 is a plan view of the timing locks in their locked position.

Figure 13 is an elevational view of the fin feeder with the timing locksoperating arms.

Figure 14 is a plan view of Figure 13. (m Figure 15 is a longitudinalview of the fin stacks,

tube support, and stack pusher.

Figure 16 is a section along line C-C, Figure 15.

Figure 1'7 is a section along line D-D, Figure 15. 5

Figure 18 is a section along line E-E, Figure 15.

Figure 19 is a section along line F-F, Figure 15.

Figure 20 is an elevational view of the solenoid 10 timing means alongline HH, Figure 5.

Figures 21 and 22 show additional details of the solenoid timing meansillustrated in Fig. 20.

Figure 23 is a view of the tube moving clamp.

Referring to Figures 1 and 2, fin I, placed upon 15 tube 2, has acentral hole 3, which, punched while the stock is fiat and to a diametersomewhat smaller than the diameter of tube 2, is then increased indiameter by dishing the material adjacent the hole 3 and as indicated soas to then 20 be a very loose fit between hole 3 and tube 2.

Figure 3 indicates the fin I amxed to tube 2 by means of straighteningout the dished portion, which tends to force the hole 3 to closelyassume its original diameter and firmly clamp fin I to 5 tube 2.

In Figure 4, continuous tube 2 is made into nested form as shown bymaking return bends of the non-finned portions 4.

In Figure 5, tube 2 passes through a primary 30 stack of free fins I a;the upper portion of tube 2 has fins I, which have been spaced andaffixed to the tube 2 during its passage through the machine. Sprocket 5fastened to shaft 6 and connected to any suitable source of power 35serves to drive the machine. Bearings l and la serve as supports forshaft 6 upon which are fastened cams 8, 9, 9a, 9b, 90, I0 and II.Sprocket I2 is fastened to shaft 6 and by means of chain I3 drivessprocket I4 fastened to shaft I5, which, supported in bearings I6 andI6a has fastened cams I1, Ila, I'lb, I10, and I8. Thrust collars I9 andI9a fastened to shafts I5 and 6 resist the thrust of cams I8 and IIIrespectively.

Lever 20 fulcrumed at 2| and supported by bushing 22, which is a freefit on shaft 6, operates pull rod 23. The vertical portion of themachine frame 24 has two projecting surfaces 25, which provide a backingmeans for anvils 26 and 26a which are oscillated by cams I10. and 90.respectively. Anvils 21 and 21a are oscil-"' lated by cams Ill) and 9band reciprocated by cams I8 and I0 respectively. The anvils 26, 26a, 21,and 21a, are pivoted in bearings 28.

The lever arms 29 and 30 pivoted on shaft 3| are oscillated by cams I1and He respectively. The lever arms 29a and 30a pivoted on shaft 3Ia areoscillated by cams 9 and 90 respectively.

Lever 32, pivoted at 33, operated by cam II, and connected to feeder endframe 34 with link' 35, has a right angled stub 36, which moves in andout of hole 31 in abutment 38 which is part of the machine frame.

Solenoid 39 fastened to the machine frame operates lever travel limit 40to cover and uncover hole 31 in response to electrical current throughcircuit leads 4I connected to timing means shown in Figures 6 and '7. I

Rods 42 and 42a connect feeder end frame 34 with feeder fingers carrier43 and have fastened arm extensions 44 and 44a to operate pull rods 45and 45a connected to timing locks 46 and 460 respectively.

The channel support 41 supports the fin stack in and tubing 2 in exactvertical and horizontal alignment.

Chain table 48 with side guides 49 serves as a support for the tube pullchains 50 and 500. which are mounted upon sprockets 6| revolving onshaft 62.

The various springs shown are for the purpose of keeping the levers incontact with their respective cams.

Referring to Figures 5a and 6, the upper portions of chains 50 and 50alie on table 48 and engage sprockets 5I at one end. The other end ofchains 50 and 50a engage sprockets 53 fastened to shaft 54 to which alsois fastened multiple ratchet 55. Pawl lever 59 oscillating about shaft54 by means of pull rod 23 carries pawls 56 and 56a engaging with theirrespective portions of multiple ratchet 55 whenever the pawl selectorbar 51 is moved to register groove 58 or 56a with the bottom end of therespective pawl. The two sections of ratchet 55 have a diflerent numberof teeth. The pawl selector bar 51 is connected to rod 60, which in turnis connected to shifting handle 6| carrying lock 62 engaging with slots63 in index plate 64. The bottom portion of chain 50 lies on idlersprocket 65 revolving on shaft 66. The bottom portion of chain 500engages sprockets 61, 68, 69, 10, H, and 12. Sprocket 69 fastened toshaft 13 to which is also fastened handwheel 14 serves as a manual meansfor moving chains 50 and 50a back and forth. Sprocket H is made inmultiple, one portion of which engages chain 50a and the other portionof which carries one end of timing chain 15, which at its other end iscarried by idler sprocket 16 revolving about shaft 66, which isshiftably mounted to allow for timing chains 15 of various lengths.

The timing chain 15 carries a cam 11, which for each revolution of thetiming chain 15, engages rocker arm 18 which operates mercury tubeswitch 19 contained in housing 80. Circuit leads 8i connect to solenoid39, Figure 5, and also to a suitable source of electric current.

Referring to Figures 7 and 8, bushings 82 pressed into bearing hubs 28provide bearings for hollow shafts 83 integral with anvils 26 and 26d.Anvils 21 and 21a. have solid shafts 84, carrying cam roller holders 85which extend beyond anvils 21 and 21a so as to engage their oppositeends whenever anvils 21 and 21a are in their closed position as shown.Plugs 86 screwed into hollow shafts 83 serve as retainers for springs81, one end of which bears against solid shafts 84, thereby tending tokeep the anvils 21 and 21a separated from anvils 26 and 26a until suchtime as cams I and I8 engage the rollers 88 of the cam roller holders85. at which time anvils 21 and 21a are forced to their closed positionagainst the pressure of springs 81.

Springs 89 serve to keep the roller ends of the The bore 92 is of aslightly larger diameter than that of tube 2, which is positionedtherein.

In Figures 9 and 10, lever arms 29 and 29a, pivoted on shafts 3I and 3la, connect to abutment blocks 93 and 93a respectively. The abutmentblocks are undercut as at 94 and practically equal to the thickness ofthe material of fins I. Lever arms 30 and 30a, pivoted on shafts 3| andHo, connect to fin separator knives 95 and 95a respectively. Theabutment block 93 and separator knife 95 work in a guide portion 96 offrame 24. The abutment block 93a and separator knife 95a work in a guideportion 96a of frame 24. Springs 91 serve to keep the roller ends oflevers 29, 29a. 30, and 30a, in contact with their respective cams.Springs 96 tend to keep timing locks 46 and 46a in their lockingposition.

In Figure 11, timing lock 46, connected to pull rod 45, is shown in itsunlocked position, whereby slot 99 provides a space in which the end oflever 30a can move unrestrained.

In Figure 12, timing lock 46 is shown in its locked. position, wherebyextensions I00 prevent the full travel of the levers 29a and 30a.

Timing lock 46a operates simultaneously and in the same manner as timinglock 46.

Referring to Figures 13 and 14, Figure 14 .is a plan view of the finfeeder assembly comprising an end frame 34 connected to lever 32 withlink 35.

Rods 42 and 42a provide an extension connection.

between end frame 34 and feeder fingers carrier 43 to both of which theyare. fastened. The feeder fingers carrier 43 has fingers IOI pivoted atI02. The fingers IOI, at their free end, have an undercut I03 whichserves as an abutment for fin I during its movement by the feederassembly. Springs I04 tend to keep fingers IOI in contact with fin I.Mounted upon rods 42 and 42a are arm extensions 44 and 44a,'which attheir opposite ends have holes I and 105a, which are a free fit for pullrods 45 and 45a, which are threaded and have abutment lock nuts I06 andN611 at one end. The other ends of pull rods 45 and 45a are connected totiming locks 46 and 460 respectively, see Figures 5, 9, and 10. The finfeeder assembly reciprocates in suitable guides, not shown, which areintegral with or fastened to the machine frame 24.

Referring to Figure 15, tube 2 at its left hand side lies in a suitabletrough support I01, the right hand side of tube 2 lies in the holes ofthe fins in primary free fin stack Ia, supported by the channel support41, intermediate the two supports is the secondary free fin stack I08held against movement by a manually collapsible abutment I 09 pivoted atIIO to a. clamp member I II engaging table means II 2 with support legsH3.

The other end of the collapsible abutment is pivoted at II4 to a strutmember II5 which engages the clamp member III at the point H6. Slot H1in both the abutment I09 and the strut member II5 allows both thesemembers to be straightened horizontally without interfering with tube 2.Intermediate both fin stacks Ia and I08 and partially encircling tube 2is the stack pusher II8 comprising a tube HQ with a bore andlongitudinal slot I20, in excess of the diameter of tube 2. One end ofthe tube II9 has a pusher plate I2I, which engages the end of theprimary free fin stack Ia. The slot I20 also passes through the pusherplate I2I. The left hand side of tube I I9 has a roller support I22 witha shaft I23 upon which are mounted roller bearings I24 rolling along thetop of the table means I I2. The roller support I22 has a pin I25 towhich is fastened cable I26, which operates in a single width groove I21of double groove sheave I 28. The cable I26 is fastened to the sheave I28 as indicated at I29. The other single width groove I30 of sheave. I28carries a cable I 3I one end of which is fastened to sheave I28 asindicated at I32 and the other end of which is fastened to a weight I33.

Referring to Figure 20, which is an elevational view of the solenoidtiming means along line H-H, Figure 5, lever 32 has a projecting stub36, which is of smaller diameter than hole 31 in the frame 24. Solenoid39 fastened to the machine frame 24 operates a lever travel limit tocover and uncover hole 31 in response to electrical current throughcircuit leads 4I connected to timing means shown in Figures 5a and 6.The

- ordinary travel of stub 36 is indicated by H.

Whenever the mercury tube switch 19, Figures 5a and 6, is in the onposition, the lever travel limit raises to the position indicated by thedotted lines andprovides a travel of the stub end 36 as indicated by I.

Referring to Figure 23, the clamp body I34 has four lugs I35 whichengage pull chains 50 and 50a as shown in Figure 6 and '1. The clampbody I34 and its associated cap I36 have a bore I31 which clamps tube 2whenever screws I38 are tightened. The take up block I39 has two lugsI40, which face in the opposite direction to that of lugs I35 on clampbody I34, their relative distances apart are such that, when forced intothe chains 50 and 50a, the clamp body I34 is rigidly held in place.Weight I4I has a stem I42, which is a loose fit in the bore of tube 2.

Having described the component parts of the machine, I shall nowdescribe its operation.

Referring to Figures 5 and 15, a multitude of punched fins are placed instacked relationship as indicated at Ia and I08. Through the center holeof the fins a suitable tube 2 projects through the machine proper and isengaged at its end by the tube moving clamp I36. The other end'of thetubing lies in the trough I01, which prevents kinking of the tubing andsince all of the elements are in line, the tube is free to move upon amovement of the tube moving clamp. The various mechanical movements areas follows: The cams 9 and I1 oscillate the lever arms 29 and 2911,which in turn oscillate the abutment blocks 93 and 93a toward the tubing2 thereby decreasing the opening between the ends of the abutment blocks93 and 93a below the width of the punched fins Ia, which are pressedtoward the abutment blocks by the stack pusher I I8, which has a forceexerted upon itself by means of the weight I33 and its associated systemof cables I26 and I3I and double groove sheave I28.

The abutment blocks 93 and 93a, after moving to the position mentionedabove, have a pause period, during which the cams 9c and I1c oscillatethe lever arms 30 and 30a, which in turn move the fin separator knives95 and 95a toward the tube 2, thereby imprisoning a single fin in theundercut space 94 and 94a of the abutment blocks 93 and 93a. Due to theangle of the fin selector knives 95 and 95a, and their movement, the finstack la is pushed back against the pressure of the stack pusher I I8 asufiicient distance toallow the fingers 'IOI to engage the imprisonedfin with their undercuts I03 when the cam II moves the lever 32 and itsassociated fin feeder assembly, Figures 13 and 14, into position.

During the movement of the fin feeder assembly, Figures 13 and 14, inposition to engage the separated fin, the abutment blocks 93 and 93a andthe fin separator knives 95 and 95a have a pause period in the positionshown in Figures 9 and 10. Immediately after the engagement of thefingers IOI with the separated fin, the abutment blocks 93 and 93a aremoved awayfrom the tube 2 thereby increasing the distance between themand allowing the fin feeder assembly to move the fin into positionbetween the anvils 26, 26a, 21, and 21a, as shown in Figure 10.

During the movement of the fin, the anvils 26 and 26a assume theirclosed position shown in Figure 7. When the moved fin is in the positionshown in Figure 10, the anvils 21 and 21a start closing and when theyare closed sufiiciently to prevent the return of the moved fin, the finfeeder assembly withdraws to its previous position. Since the top andbottom of the moved fin engages the anvils 21 and 21a respectively, thefingers IOI slip off the moved fin. The anvils 21 and 21a then assumetheir closed position, in which the pins- 90 in anvil 21a definitelyprevent any rotation of the fin and thereby ensure the edges of the-finbeing in alignment with prior afiixed fins.

After the anvils 21 and 21a have assumed their closed position, the camsI0 and I8 then reciprocate the anvils 21 and 21a to the closed positionshown in Figure 8, during which the dished portion of the fin isflattened and the fin grips the tube 2 as shown in Figures 2 and 3.

During theaflixing of the moved fin, the fin separator means hasseparated another fin from the stack Ia and the fin feeder assembly hasreturned to its previous position.

After the fin is afiixed to the tube, the cams I0 and I8 allow theanvils 21 and 21a to separate from the anvils 26 and 26a by means of thesprings 81. During the separation, the anvils 26,,

26a, 21, and 21a, assume their open position.

After the anvils reach their open position, the

cam 8, Figure 5, with its associated system of lever 20, pull rod 23,pawl lever 59, pawl 58 or 56a,

ratchet 55, shaft 54, and sprockets 53 moves the chains 50 and 50a withwhich the tube moving clamp, Figure 23, engages. The amount of the chainmovement determines the spacing of the fins. Since the number ofdifferent spacings is rather limited, I have shown a system in Figures5a and 6 whereby the spacing may be changed ,,.at"will and with aminimum of delay. The pawl lever 59 has a definite angular movement andcarries the pawls 56 and 56a through definite arcs. However by means ofthe shiftable pawI selector bar 51 with its grooves 58 and 58aassociated with the ends of pawls 56 and 56a, which in turn areassociated with the multiple ratchet 55, it is possible, by means of theindexed shifting handle 6I to make a quick change in the spacing of thefins by varying the increments of movement of the chains 50 and 50a.

The method of controlling the length of the recurrent finned portions ofthe tube 2 is as follows: As the chains 50 and 50a must move equaldistances for equal finned and non-finned portions of the tube '2, thetiming chain 15, moving in unison with the chains 60 and 50a, andcarrying cam 11, is of a length equal to a finned and non-finned length.The cam 11 and rocker arm 18 are of such proportions that the mercurytube switch establishes an electrical circuit for a length of chaintravel equivalent to the desired length of the non-finned portion of thetube 2; therefore the circuit is on for the non-finned length and thecircuit is oil for the finned length. Since the non-finned lengthnecessary to form the'return bends 4, Figure 4, is constant, it followsthat any given variation in the length of the timing chain ID, will givean equivalent variation in the length of the finned portion of tube 2;therefore to get any definite length of the finned portion, it is onlynecessary to use a chain of a length equal to the'desired length of thefinned portion plus the length of the non-finned portion and theoperation of the machine will result in continually recurrent on and of!cycles of the electrical circuit in definite relation to the travel ofthe chains 50 and 50a.

The electrical circuit 8| of the mercury tube switch 19 and the circuit4| of the solenoid 39, Figures 5 and 20, are placed in series with asuitable source of supply.

Whenever the mercury tube switch 19 is in the on position, the solenoid39 is energized and the lever travel limit 40, Figures 5 and 20, risessufilciently to cover the hole 31 in the machine frame 24, and viceversa.

During the finning operation, the solenoid being non-energized, the hole31 being uncovered, and the lever 32 being allowed its'full travel, thefin feeder assembly, Figures 13 and 14, also has a full travel.

Referring to Figures 5, 9, 10, 11, 12, 13, and 14, it will be noted thatthe fin feeder assembly carries extension arms 44 and 44a, which attheir extreme ends have holes [05 and Mia, which are a loose fit forpull rods 45 and 45a, which, at the end associated with the arms 44 and44a are provided with abutment lock nuts I95 and Mia, which allow thepull rods 45 and 45a to move with the fin feeder assembly. The oppositeend of the pull rods 45 and 45a being connected to timing locks 46 and46a, the timing locks move in unison with the fin feeder assembly. Thetiming locks 46 and 46a are of such shape that, whenever the fin feederassembly has a full travel, the levers 29, 29a, 30, and a, and theassociated abutment blocks 93 and 93a, and the fin separator knives 95and 95a also have their full travel, each stroke of the variousabovementioned elements separating an individual fin from the stack laand moving it into the afilxing position.

During the time that the solenoid 39 is energized, the lever travellimit covers the hole 31 and the stub 36 of the lever 32 being deniedentrance into the hole 31, the fin feeder assembly travel is limited.Due to the reduced travel of the pull rods and 45a, the timing locks 46and 46a remain in the position shown in Figure 12, thereby preventingsprings 91, acting upon levers 29, 29a, 30, and 30a, opening theabutment blocks 93 and 93a, also the fin separator knives 95 and 95a. Inthe locked position as described above, the particular separated finbetween the abutment blocks 93 and 93a and the fin separator knives 95and 95a remains in this position and since the fin feeder assemblytravel is limited, the fingers Iill do not engage the separated fin. Allthe movements of the other various parts occur as previously. Upon thebreaking of the solenoid circuit the operations all proceed as before.

Due to various causes, there may be at times, a necessity to removedefectively placed fins from accuse the tubing. This can be accomplishedby moving theshifting handle ii, Figure 6, to its proper position,thereby disengaging pawls I4 and 5611 from the ratchet II. This allowsthe chains g and Ila to be moved by the hand wheel I4, bringing thedefectively finned portion outside of the aiiixing portion of themachine, in which position the defective fins may be removed by cuttingthem off the tube. After the defective fins have been removed, thefinned tubing is moved back to proper position, where the operation mayagain be resumed. Because the tube 2, chains 50 and 50a, and the timingchain 15 all move in unison, it is possible to remove any amount ofdefective fins, without aifecting the lengths of the finned andnon-finned portions, upon the resumption of the finning operation.

Referring to Figure 15, it will be noted that the force exerted by thestack pusher I I 8 varies with the length of the fin stack la, by meanspreviously explained. The purpose of this variation is to compensate forvariation in friction between the stack la and the channel support 41.

Referring to Figures 6 and 23, it will be noted that the tube movingclamp is shiftably mounted upon the chains 50 and 50a, thereby allowinga wide latitude in manual timing of the machine, especially when makingvery special coils.

While the above shows the preferred form of machine and method ofafiixing the fins to the tubing it is understood that there may bevariations without departing from the spirit and scope of the invention.

What I claim is:

1. In a machine for fabricating finned tubing, the combination of meansto space the fins upon the tubing and means afiixing them thereto for apredetermined length and means making the spacing means inoperative fora predetermined length, both means being alternate in operation.

2. In a machine for fabricating finned tubing, the combination of meansto stack a multitude of free fins upon the tubing, means to feed thetubing through the stacked fins and means to space the fins upon thetubing and means afilxing them thereto for a predetermined length andmeans making the spacing means inoperative for a predetermined length,both last named means being alternate in operation.

3. In a machine for fabricating finned tubing, the combination of meansto stack a multitude of free fins upon the tubing, means to feed thetubing through the stacked fins and means for withdrawing successivefins from the stack and spacing them upon the tubing and means ailixingthem thereto.

4. In a machine for fabricating finned tubing, the combination of meansto stack a multitude of free fins upon the tubing, means to feed thetubing through thestacked fins and means for withdrawing successive finsfrom the stack and spacing them upon the tubing and means affixing themthereto for a predetermined length and means making the withdrawal meansinoperative for a predetermined length, both last named means beingalternate in operation.

5. In a machine for fabricating finned tubing, the combination of meansto stack a multitude of free fins upon the tubing, means to feed thetubing through the stacked fins and means withdrawing successive finsfrom the stack and spacing them upon the tubing. I

6. In a machine for making finned tubing, means to stack the fins freelyupon the tubing,

a,oes,sae

means to withdraw individual fins from the stack, means to afiix thefins to the tubing, and the withdrawing means moving the fin to thepoint of the affixing operation.

5 7. In a machine for making finned tubing, means to stack the finsfreely upon the tubing, means to withdraw individual fins from thestack, means to afiix the fins to the tubing, and the withdrawing meansmoving the fin to the point of the afflxing operation and means wherebythe stack is kept in operative relationship with the withdrawal meansirrespective of the stack size- 8. In a machine for making finnedtubing, means to stack the fins freely upon the tubing,

means to withdraw individual fins from the stack, means to aflix thefins to the tubing, and the withdrawing means moving the fin to thepoint of the affixing operation and means whereby the stack is kept inoperative relationship with the withdrawal means irrespective of thestack 'size,

the said second last means exerting a force variable with the stacksize.

9. In a machine for making finned tubin means to space individual finsupon the tubing, movable anvil means to affix the spaced fin to thetubing, the last named means alternately approaching and receding fromthe tubing in timed relationship with the spacing means.

10. In a machine for making finned tubing with alternate finned portionsand unfinned portions, timing means whereby the alternate portions arekept in their proper relationship the said timing means governing thefeeding of the fins to the tube during its passage through the machinein which the fins are amxed to the tube. 11. In a machine for makingfinned tubing with alternate finned portions and unfinned portions,timing means whereby the alternate por-' tions are kept in their properrelationship the 40 said timing means governing the feeding of the finsto the'tube during its passage through the 145 12. In a machine formaking finned tubing with alternate finned portionsandunfinned'portions, timing means whereby the alternate portions are keptin their proper relationship the said timing means governing the feedingof the fins to the tube during its passage through the machine in whichthe fins are afilxed to the tube, the said timing means being adjustablefor different lengths, the adjustment varying only the length of thefinned portions.

55 13. In a machine for making finned tubing,

means, to move the tubing, means to space individual fins upon thetubing, means to afiix the fins upon the tubing, carrier means toprevent sliding friction against the aiilxed fins edges during the gomovement, the said carrier means comprising a driven chain.

14. In a machine forv making finned tubing,

means to move the tubing, means to space individual fins upon thetubing, means to aflix the g5 fins upon the tubing. carrier means toprevent sliding friction against the afilxed fins edges during themovement, the said carrier means traveling at the same rate of speed asthe tubing and comprising a driven chain.

I 10 15. In a machine for making finned tubing,

ondary movement to the anvil means when in position to afiix the fin tothe tubing.

16. In a machine for making finned tubing having substantiallyrectangular fins afiixed thereto and with alternate finned and unfinnedportions, means to move the tubing, means to space and afiix the fins tothe tubing and means to keep the spaced fins in edgewise alignment priorto the afiixing operation.

17. In a machine for making finned tubing having substantiallyrectangular fins afilxed thereto, the combination of anvil means forafiixing the fins to the tubing,'means to move the anvil means in andout of operative position and means associated with the anvil means,whereby when the anvil means is in operative position, the fin is keptin edgewise alignment with the previously affixed fins.

18. In a machine for making finned tubing, the combination of means tomove the tube, a multitude of fins stacked freely upon the tube,separator means to separate individual consecutive fins from the end ofthe stack, means to move the separated fin to its affixing position,means to affix the separated fin to the tube, the last namedmeansremoving the separated fin from its 'moving means upon the returnmovement of the moving means. I

19. In a machine for making'finned tubing, the combination of means tomove the tube, a stack of free fins upon the tube,-means for spacing andafilxing the fins to the tube, support means for the tube before andafter the aflixing operation and support means for the fin stack, thecooperation of the support means preventing binding of the tube in thefin stack.

20. In a machine for making finned tubing, the combination of means tomove the tube, a stack of free fins upon the tube, means for spacingand.

afiixing the finsto the tube, support means for the tube before theaffixing operation, support means for the fin stack and support meansfor the finned tubing, the last named support means comprising a drivenchain moving at the-same rate of speed as the tubing. v r 21. In amachine for making finned tubing,

the combination of means to space the fins, means to aiiix the fins tothe tubing, primary means to move the tubing in timed relationship tothe fin spacing means, means to operatively disconnect. the primarymoving means and manual means to move the tubing independent r he p m y1 means, manual means to move the tubing in two directions andindependent of the primary mov-' ing means and the fin spacing means.

23. In a machine for making-finned tubing, anvil means for fastening thefins to the tubing, resilient means to move the anvil means intooperative position and cam means to move the anvil means out ofoperative position. I

24. In a machine for making finned tubing, anvil means for fastening thefins to the tubing and comprising at least four sections, means to movethe anvil means into and out of operative position, part .of the anvilmeans being at one side of the fin being fastened and the remainderofthe anvil means being at the opposite side of the fin.

- ANTHONY F. HOESEL.

55 vtion and in timed relationship with fin spacing

